cos(15°) =_____________

• A. (1 – \(\sqrt{3}\))/2\(\sqrt{2}\)
• B. (\(\sqrt{3}\) + 1)/2\(\sqrt{2}\)
• C. (\(\sqrt{3}\) – 1)/2\(\sqrt{2}\)
• D. (-\(\sqrt{3}\) – 1)/2\(\sqrt{2}\)